matlab　　用起泡法对10个数由小到大排序，即将相邻的两个数比较，将小的调到前头。

　　程序编写一个函数文件，实现以下功能：输入一个数组，对其元素进行从大到小的排列，将排序后的数组输出；求数组元素的最大值并求出它在原数组中的位置。

（3）有一个4×5矩阵，编程求其最大值及其所处的位置。

（4）编程求∑_(n 1)^20▒ n!

（5）有一个函数f(x,y) x^2+sinxy+2y,写一个程序，输入自变量的值，输出函数值。

-matlab with bubble sort method to 10 the number of small to large, we will compare two adjacent numbers, will be transferred to the top of the small. Programming a function file, the following functions: Enter an array, its elements in descending order, the array output sorted　the maximum demand of the array elements and find out its position in the original array. (3) has a matrix 45, seeking the maximum value and the programmed location. (4) programming requirements Σ_ (n　 1) ^ 20▒ n! (5) there is a function f (x, y)　 x ^ 2+sinxy+2y, write a program that value, the output value of the input function arguments.